Chemical Engineering - Polymer Technology

41. 

Synthetic rubber

A. deforms, if stretched to double of its original dimension.
B. is brittle at low temperature
C. is softer at higher temperature.
D. is highly permeable to air & water and is readily attacked by chemicals & atmospheric gases.

Answer: Option D

Explanation:

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42. 

Melamine formaldehyde resin which has a very high anti tacking properties, is not used for the

A. electrical insulation purpose.
B. tanning of leather.
C. strengthening of plaster of paris.
D. decorative laminates.

Answer: Option C

Explanation:

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43. 

In a co-polymer, the repeating units contain two different monomers. Which of the following is a copolymer ?

A. PTFE
B. Buna-S
C. PMMA
D. Polycaprolactum

Answer: Option B

Explanation:

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44. 

Cation exchange resins used in water treatment is made from __________ resin.

A. urea formaldehyde
B. epoxy
C. amino
D. phenolic

Answer: Option A

Explanation:

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45. 

Size range of polymer molecules varies from __________ metre.

A. 10-2 to 10-5
B. 10-4 to 10-7
C. 10-1 to 10-2
D. 10-8 to 10-10

Answer: Option A

Explanation:

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